SEPTEMBER, I95 I THE ANALYST Vol. 76, No. 906 PROCEEDINGS OF THE SOCIETY OF PUBLIC ANALYSTS AND OTHER ANALYTICAL CHEMISTS THE AMERICAN CHEMICAL SOCIETY On Wednesday, September 5th, in New York, the President, Dr. J. R. Nicholls, C.B.E., presented the following address to the American Chemical Society on the occasion of the celebration of the 75th Anniversary of its foundation- FROM THE SOCIETY OF PUBLIC ANALYSTS AND OTHER ANALYTICAL CHEMISTS TO THE AMERICAN CHEMICAL SOCIETY On the occasion of the Celebration in New York, in September, 1951, of the Seventy- Fifth Anniversary of the founding of the American Chemical Society, the President, Council and Members of the Society of Public Analysts and Other Analytical Chemists send Greetings to the Officers and Members of the American Chemical Society.The Society sincerely welcomes the opportunity thus given to it in its own seventy-eighth year to express the friendship and goodwill of all its members to their American confreres celebrating the seventy-fifth anniversary of their Society, and offers its best wishes for the continued prosperity of the American Chemical Society . (Signed) J. R. NICHOLLS (Presideizt). J. H. HAMENCE (Honorary Treas24rer). K. A. WILLIAMS (Honorary Secretary). Dated this Third day of September Nineteen Hundred and Fifty One. 0 Seal of the Society of Public Analysts and Other Analytical Chemists XIIth INTERNATIONAL CONGRESS OF PURE AND APPLIED CHEMISTRY, SEPTEMBER 10th TO 13th, 1951 THE Council of the Society of Public Analysts and Other Analytical Chemists has appointed Dr, J.R. Nicholls, C.B.E., Mr. R. C. Chirnside and Dr. K. A. Williams as delegates to the XIIth International Congress of Pure and Applied Chemistry. BIOLOGICAL METHODS GROUP THE Summer Meeting of the Group was held at 2 p.m. on Friday, June lst, 1951, at the National Institute for Medical Research, The Ridgeway, Mill Hill, London, N. W.7. The following papers were presented and discussed: “Errors of the Mouse Insulin Assay,’’ by P. A. Young and G. A. Stewart; “Simplification in Statistical Computation,” by D. C. Gilles; “Cup-plate Assays of Biotin and Nicotinic Acid,” by S. Morris and A. Jones. 503504 JOHNSON AND KING: THE DETERMINATION OF [Vol. 76 From 4 p.m. until 6 p.m. the following demonstrations were presented: “Demonstrations of Some of the Less Well-known Methods of Biological Assay in use at the National Institute for Medical Research,” by W. L. M. Perry; “Assay of Digitalis,” by G. F. Somers; “Assay of Vitamin B,, with EugZena gracilis,” by P. Waterhouse; “Microbiological Assay of Crude Extracts Containing Several Growth Factors,” by F. A. Robinson and B. W. Williams; ‘‘Apparatus for Automatic Recording of Blood-clotting Times,” by S. S. Randall.